Folding table



Oct. 29, 1963 F. p. KNOBLOCK I 3,103,559

' FOLDlNG TABLE."

Filed Nov. 7, 1960 V 3 Sheets-Sheet 1 INVEN TOR. Fee-0:21am D. Kuoezoex ATTORNEYS FOLDING TABLE Filed Nov. 7, 1960 3 Sheets-Sheet 2 INV EN TOR.

Fesasmcx D. [(NOBLOCK ATTORNEYS Oct. 29, 1963 NoB oc 3,108,550

- FOLDING TABLE I 7 Filed Nov 7, 1960 Y s Sheets-Sheet s uvmvrox FREDERICK D. KNOBLOCK Flo. l0

v- M ATTORNEYS United States Patent 3,108,556 FQLDING TABLE Frederick D. Knohloclr, Bloomfield Hills, Mich. Auto Glass Mfg. Co., 8761 Grinneli, Detroit 13, Mich.)

Filed Nov. 7, 196%, Ser. No. 67,542 14 Qiaims. (Cl. 1tl3l24) This invention relates to folding tables and particularly to folding tables of the type readily folded into flat compact form for storage and which can be unfolded and erected without the use of tools.

In the patent to Frederick D. Knoblock and Albert C. Koett, 2,902,325, titled Folding Support Base for Table Top, issued September 1, 1959, there is disclosed a foldable base on which a tray is adapted to rest which comprises side members each made of a single length of elongated tubing and having a U-shape. Each side mem her is positioned so that the lower arm is adapted to rest upon the floor and the upper arm is adapted to support the table. The members are spaced apart with their bight portions extending upwardly. A main frame member comprising a single length of elongated tubing of inverted U-shape is provided with the legs thereof parallel to the bight portions of the side members. The bight portions of the side members are hinged to the legs of the main frame member and the side members are adapted to be folded into compact relationship adjacent the main frame member.

It is an object of this invention to provide an improved folding table of such a construction which is more compact.

lt is a further object of the invention to provide such a table which includes novel hinge means.

It is a further object of the invention to provide such a table which includes novel means for mounting a tray or table top thereon, which top is adapted to remain as a part of the table both the folded and unfolded conditions.

It is a further object of the invention to provide such a table which can be manufactured at relatively low cost.

In the drawings:

FIG. 1 is a perspective view of a folding table embodying the invention.

FIG. 2 is a plan view of the table in folded condition.

FIG. 3 is a side elevation of the table in folded-condition, the broken lines showing the table in unfolded condition.

FIG. 4 is a fragmentary sectional view on an enlarged scale taken along the line 4-4 in FIG. 2.

FIG. 5 is a rear elevational view of the portion of the table shown in FIG. 4.

FIG. 6 is a plan view of the table in unfolded condition, parts being broken away.

FIG. 7 is a sectional view taken along the line 7-7 in FIG. 1.

FIG. 8 is a sectional view taken along the line 88 in FIG. 6.

FIG. 9 is a fragmentary sectional view taken along the line 99 in FIG. 6.

FIG. 10 is a fragmentary plan view of a modified form of table.

Referring to FlG. 1, the folding table comprises four elements, namely, a main frame member 20, side frame 3-,l8,55 Fatented Oct. 29, 1963 members 21a, 21b, and a tray 22. Main frame member 2% is made of a single length of tubing and has an inverted U-shape comprising generally vertical legs 23a, 2312 connected by a horizontal cross or bight portion 24. Each side member 21a, 21b is also made of a single length of tubing and comprises horizontal legs 25a, 25b, 26a,-26b connected by a vertical cross or bight portion 27a, 27b. Longitudinally spaced hinges 23 pivot each side member 210, Mb to the vertical legs 23a, 23b of the main frame member 20 for swinging movement about the axis of vertical bight portions 27a, 27b. As shown, for example, in FIG. 7, each hinge 28 comprises a block 29, preferably of plastic material, which is fixed to a vertical leg 23a by a pair of bolts 3% extending through spaced openings 31 in the leg 23:: and having acorn nuts 32 threaded on the ends thereof. Each block 29 comprises a pair of spaced flexible fingers 33 that are snapped over the bight portion 27:: of the adjacent side member 21a so that the side member 21:: is hinged to the block 2? and, in turn, the main frame member 20. The use of the plastic 29 not only permits the hinge to be disconnected but, in addition, provides for a freely pivoted hinge. By this arrangement, each side member 21a, 21b is adapted to swing about an axis parallel to the axis of the legs 23a, 23b of the mainframe 26.

As shown in FIG. 2, the bight portion 24 of the main frame member 20 is bent intermediate its end nearer one leg 23b than the other leg 23a. The extent of the bent portion 24a is such that the one leg 23b lies in a plane with the leg 27a of the side member Zia when the table is in folded condition. As shown, when the side member 21a is brought into position with its plane generally parallel to the plane of the main frame member, the other side member 21b can then be pivoted to bring its plane into parallelism with the main frame member 20 and the first side member 21a.

Tray 22 is adapted to be mounted on the bight portion 24 of main frame 20 for swinging movement about two axes, one is the axis of the bight portion 24 and the other is an axis at a right angle to the axis of the bight portion 24- and at a right angle to the plane of the tray;

-so that the tray can be brought into position, as shown in FIG. 1, wherein it is supported by the upper legs 25a, 25b and bight portion 24 or so that it can be pivoted into a folded'position with its side members Zla, 21b, as shown in FIGS. 2 and 3, parallel to the plane of the main frame member 20'.

The hinge joint 35 by which this arrangement is achieved is shown in FIGS. 4 and 5 and comprises a right angle bracket 36 to which tray 22 is pivoted by a rivet 37 for swinging movement about an axis at right angles to the plane of the tray. As shown in FIG. 4, a shim 38 is provided between one leg of the bracket 36 and the tray to facilitate the pivoting action. A block 39, preferably of plastic material, is fastened to the other leg of the bracket 36 by nivets. Block 39 includes a pair of spaced flexible fingers 40 that are adapted to snap over the bight portion 24 of main frame member 20 to pivot the block 39 and, in turn, the bracket 36 and tray 22 to hhe bight portion 24. In this fashion, the tray 22 can be pivoted or swung up or down with respect to the bight portion 24 and can also be rotated about an axis at right angles to the axis of the bight portion 24-.

When the tray 22 is brought into position on the unfolded legs 25a, 25b of side members 21a, 21b, the tray 22 is removably fastened thereto by blocks 41, preferably of plastic, fixed on the underside of the tray by rivets 42 and having spaced flexible fingers 43 that snap over the upper legs 25a, 25b of side members 21a, 21b. As shown in FIGS. 6 and 8, the blocks 41 are so positioned that they engage to the free ends of the legs 25a, 25b of side members 21.

In order to provide even greater rigidity, rubber bumpers 45 are fastened to the tops of legs 25a, 25b intermediate their ends and at the top of member 24 to engage the underside of the tray 22 (FIG. 9).

As shown in FIGS. 1 and 6, in the unfolded condition, the planes of the side members 21a, 21b are at right angles to the plane of the main frame member 20 with the lower legs 26a, 26b of side members 21a, 21b engaging the floor. The lower ends 23c, 23d of the legs 23a, 23b of main frame member 20 extend forwardly and engage the floor. The bight portion 24 of the main frame member 20 and the upper legs 25a, 25b of the side frame members 21a, 21b in substantially the same plane when the blocks 41 on the underside of the tray 22 are engaging the upper legs 25a, 25b adjacent their free ends.

In order to collapse or fold the table, the tray 22 is lifted upwardly disengaging the fingers 43 on the blocks 41 from the legs 25a, 25b. The tray 22 is then swung about the axis of the rivet 37 180 degrees (FIG. 4) and then permitted to swing downwardly about the axis of the bight portion 24, swinging the block 39 and assuming the position shown in FIG. 3. The one side member 2111 may be then folded into position as shown in FIG. 2 followed by the other side member 21b.

As shown in FIGS. 4, and 6, screws 47 locate the position where block 39 on tray 22 engages bight portion 24. Longitudinally spaced screws 48 on legs 27a and 27b determine the relative longitudinal positions of the main frame member 20 and side members 21a, 21b (FIGS. 1 and 3).

In the form of the invention shown in FIG. 10, the hinge assemblies 28 are reversed in their arrangement, the hinge assemblies being fixed to the vertical legs of members 21a, 21b and hinged about the vertical legs of side members 20 and adapted to removably or detachably engage the vertical legs of the main frame member 20. This form of the invention folds in substantially the same manner as the other form of the invention and involves a reversal of the leg on which the hinge means are mounted. This form increases the distance between the side members 21a, 21b when the table is unfolded.

Instead of providing the hinge 35 on the tray 22 in such a manner that it engages the bight portion 24, the hinge 35 can be positioned on the tray 22 so that it engages the upper horizontal leg 251] of side frame member 21b. In such a case, the block 41 on the tray 22 which normally engages the upper horizontal leg 25b is repositioned so that it engages the bight portion 24 of the main frame member 20.

It can thus be seen that there has been provided an improved folding table construction which is more compact; which involves novel hinge means; and wherein the tray remains as a part of the folded or unfolded construction. Because of the use of preformed blocks of plastic or the like, rivets and bolts, the overall cost of manufacture of the folding table is kept at a minimum. In each form of the invention, the side frame members are hinged for swinging movement about the vertical legs of either the main frame member or the side frame members. Since the hinges are disconnectable, the side and frame members may be readily interchanged thereby facilitating the handling of the parts during shipment and storage by the seller. The folding table can be readily disassembled without marring the finish of any of the parts.

I claim:

1. A folding table structure comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member being pivoted to the remaining portion of main frame member so that it may be folded fiat against the main frame member parallel to the remaining portion of said connecting cross portion, said offset portion being of such an extent that said one leg of said main frame member lies substantially in the plane of said one side member when the side member is folded, the other said side member being pivoted to said offset portion main frame member so that it may be folded fiat against the one said folded side frame member, a tray, and means for mounting said tray adjacent an edge thereof on the cross portion of said main frame member for swinging movement about an axis parallel to the axis of the remaining portion of said cross portion of said main frame member and about an axis substantially perpendicular to the plane of the tray in such a manner that said tray can be supported on the upper arms of said side members when the side members are unfolded and can be supported vertically adjacent on the side of the main frame member opposite said folded side members with the top surface thereof facing outwardly.

2. A folding table structure adapted to receive and hold a table top comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member being pivoted to the remaining portion of the main frame member so that it may be folded flat against the main frame member parallel to the remaining portion of said connecting cross portion, the other said side member being pivoted to said offset portion of the main frame member so that it may be folded flat against the folded side frame member, each said means pivotally connecting a side member to said main frame member comprising a hinge member fixed to one of said main frame member and said side member and having a pair of flexible fingers disconnectably engaging the other of said side member and said main frame member.

3. A folding table structure adapted to receive and hold a table top comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending port-ions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally conrun necting said vertical portions of the side members, respectively, to the two legs of the main frame member, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member being pivoted to the remaining portion of the main frame member so that it may be folded flat against the main frame rnember parallel to the remaining portion of said connecting cross portion, the other said side member being pivoted to said offset portion of said main frame member so that it may be folded flat against the folded side frame member, each said means pivotally connecting said side members to said main frame member comprising a hinge member fixed to said main frame member and having a pair of flexible fingers disconnectably engaging the vertical portion of a side member.

4. A folding table structure adapted to receive and hold a table top comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially indentioally dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member being pivoted to the remaining portion of the main frame member so that it may be folded fiat against the main frame member parallel to the remaining portion of said connecting cross portion, the other said side member being pivoted to said offset portion of said main frame member so that it may be folded flat against the folded side frame member, said means pivotally connecting said side member to said main frame member comprising a hinge member fixed to said side member and having a pair of flexible fingers idisconnectably engaging a vertical leg portion of said main frame member.

5. A folding table structure comp-rising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said one side member being pivoted to the main frame member so that it may be folded against the main frame member, the other said side member being pivoted to said main frame member so that it may be folded against the folded side frame member, a tray, means for mounting said tray on the cross portion of said main frame member for swinging movement about the axis of said cross portion of the main frame member and about an axis at a substantially right angle to the plane of the tray in such manner that said tray can be supported on the upper arms of said side members when the side members are unfolded and can be supported vertically adjacent on the side of the main frame member opposite said folded side members with the top surface thereof facing outwardly.

6. The combination set forth in claim wherein said means comprises a bracket mounted for pivotal movement about an axis generally at a right angle to the plane of said tray, a hinge member fixed to said bracket and rotatably engaging the cross portion of the main frame member.

7. The combination set forth in claim 6 wherein said latter hinge member comprises a block of plastic material having a pair of spaced fingers snapped over the bight portion of the frame member thereby detachably engaging said frame member, said bracket being fixed to said binge member so that the pivotal axis of said bracket to said tray is generally parallel to said fingers.

8. A folding table structure adapted to receive and hold a table top comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means p-ivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member for swinging movement about the axes of said last mentioned vertical portions of said side members, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member being pivoted to said remaining portion of said main frame member so that it may be folded flat against the main frame member, parallel to the remaining portion of said connecting cross portion, said offset portion being of such an extent that said one leg of said main frame member lies substantially in the plane of said one side member when the side member is folded, the other said side member being pivoted to said offset portion of said main frame member so that it may befolded fiat against the one said folded side frame member.

, 9. A folding table structure comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member for swinging movement about the axes of said last mentioned vertical portions of said side members, said one side member being pivoted to the main frame member so that it may be folded against the main frame member, the other said side member being pivoted to said main frame member so that it may be folded against the folded side frame member, a tray, means for mounting said tray on the cross portion of said main frame member for swinging movement about an axis parallel to that of said cross portion of said main frame member and to rotate about an axis substantially at a right angle to the plane of the tray in such a manner that said tray can be supported on the upper arms of said side members when the side members are unfolded and can be supported vertically adjacent on the side of the main frame member opposite said folded side members with the top surface thereof facing outwardly.

10. A folding table structure comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical port-ions of the side members, respectively, to the two legs of the main frame member for swinging movement about the axes of said two legs of said main frame member, said one side member being pivoted to the main frame member so that it may be folded flat against the main frame member the other said side member being pivoted to said main frame member so that it may be folded against the folded side frame member, a tray, means for mounting said tray on the cross portion of said main frame member for swinging movement about an axis parallel to that of said cross portion of said main frame member and to rotate about an axis substantially at a right angle to the plane of the tray in such a manner that said tray can be supported on the upper arms of said side members when the side members are unfolded and can be supported vertically adjacent on the side of the main frame member opposite said folded side members with the top surface thereof facing outwardly.

11. A folding table structure comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member being pivoted to said remaining portion of said main frame member so that it may be folded flat against the main frame member, parallel to the remaining portion of said connecting cross portion, said offset portion being of such an extent that said one leg of said main frame member lies substantially in the plane of said one side member when the side member is folded, the other said side member being pivoted to said offset portion of said main frame member so that it may be folded flat against the one said folded side frame member, a tray, and means for mounting said tray on the cross portion of said main frame member for swinging movement about the cross portion of the main frame member and pivoting movement about an axis at substantially an acute angle to the axis of the cross portion of the main frame memher in such a manner that said tray can be supported on the upper arms of said side members when the side members are unfolded and can be supported vertically adjacent on the side of the main frame member opposite said folded side members with the top surface thereof facing outwardly.

12. A folding table structure adapted to receive and hold a table top comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member being pivoted to said remaining portion of said main frame member so that it may be folded flat against the main frame member parallel to the remaining por- 0 tion of said connecting cross portion, said offset portion being of such an extent that said one leg of said main frame member lies substantially in the plane of said one side member when the side member is folded, the other said side member being pivoted to said offset portion of said main frame member so that it may be folded flat against the folded side frame member, each said means pivotally connecting said side members to said main frame member comprising a hinge member being fixed to said main frame member and having a pair of flexible fingers adapted to engage the vertical portion of a side member, and stop means on said vertical leg portions of said side members for limiting the axial movement of said hinge members and, in turn, said main frame member relative to said side members along the axis of the vertical leg portions.

13. A folding table structure adapted to receive and hold a table top comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said connecting cross portion of said main frame member having an offset portion extending out of the plane of said remaining portion, said one side member'being pivoted to said remaining portion of said main frame member so that it may be folded fiat against the main frame member parallel to the remaining portion of said connecting cross portion, said offset portion being of such an extent that said one leg of said main frame member lies substantially in the plane of said one side member when the side member is folded, the other said side member being pivoted to said offset portion of said main frame member so that it may be folded fiat against the folded side frame member, said means. pivotally connecting said side members to said main frame member comprising a hinge member fixed to said side member and having a pair of flexible fingers adapted to engage a vertical leg portion of said main frame member, and stop means on said main frame member for limiting the axial movement of said hinge members on said main frame member.

14. A folding table structure comprising a main frame member having two substantially vertical leg portions and a connecting cross portion at the top thereof, two side members, each side member having a lower arm for resting horizontally on a floor, an upper arm substantially parallel to the lower arm, the arms of each side member being connected by vertically extending portions, said vertically extending portions being disposed, respectively, in close proximity to and parallel to the two legs of the main frame member, substantially identically dimensioned means pivotally connecting said vertical portions of the side members, respectively, to the two legs of the main frame member, said one side member being pivoted to the main frame member so that it may be folded against the main frame member, the other said side member being pivoted to said main frame member so that it may be folded against the folded side frame member, a tray, means for mounting said tray on the cross portion of said main frame member for swinging movement about the axis of said cross portion of the main frame member and about an axis lying in a plane substantially at a right angle to the plane of the tray, said latted hinge member comprising a block of plastic material having a pair of spaced fingers snapped over the bight portion of the frame member thereby detachably engaging said frame member, and stop means on the cross portion of the main frame member limiting the References Cited in the file of this patent movement of said block of plastic material axially along UNITED STATES PATENTS the axrs of the cross portlon of the mam frame member in such a manner that said tray can be supported on the 1,797,847 Vandagnfi Man 1931 upper arms of said side members when the side mem- 5 Flagstad 3 1937 bers are unfolded and can be supported vertically ad- 2,472,549 591111126 June 1949 jacent on the side of the main frame member opposite 216921175 1954 said folded side members with the top surface thereof 2,808,100 Pontm 1957 f i outwardly 2,851,166 Block Sept. 9, 1958 10 2,857,227 Jacques Oct. 21, 1958 2,873,156 Bontm'ck Feb. 10, 1959 2,902,325 Knoblock Sept. 1, 1959 2,963,761 Haydock Dec. 13, 1960 

1. A FOLDING TABLE STRUCTURE COMPRISING A MAIN FRAME MEMBER HAVING TWO SUBSTANTIALLY VERTICAL LEG PORTIONS AND A CONNECTING CROSS PORTION AT THE TOP THEREOF, TWO SIDE MEMBERS, EACH SIDE MEMBER HAVING A LOWER ARM FOR RESTING HORIZONTALLY ON A FLOOR, AN UPPER ARM SUBSTANTIALLY PARALLEL TO THE LOWER ARM, THE ARMS OF EACH SIDE MEMBER BEING CONNECTED BY VERTICALLY EXTENDING PORTIONS, SAID VERTICALLY EXTENDING PORTIONS BEING DISPOSED, RESPECTIVELY, IN CLOSE PROXIMITY TO AND PARALLEL TO THE TWO LEGS OF THE MAIN FRAME MEMBER, SUBSTANTIALLY IDENTICALLY DIMENSIONED MEANS PIVOTALLY CONNECTING SAID VERTICAL PORTIONS OF THE SIDE MEMBERS, RESPECTIVELY, TO THE TWO LEGS OF THE MAIN FRAME MEMBER, SAID CONNECTING CROSS PORTION OF SAID MAIN FRAME MEMBER HAVING AN OFFSET PORTION, EXTENDING OUT OF THE PLANE OF SAID REMAINING PORTION, SAID ONE SIDE MEMBER BEING PIVOTED TO THE REMAINING PORTION OF MAIN FRAME MEMBER SO THAT IT MAY BE FOLDED FLAT AGAINST THE MAIN FRAME MEMBER PARALLEL TO THE REMAINING PORTION OF SAID CONNECTING CROSS PORTION, SAID OFFSET PORTION BEING OF SUCH AN EXTENT THAT SAID ONE LEG OF SAID MAIN FRAME MEMBER LIES SUBSTANTIALLY IN THE PLANE OF SAID ONE SIDE MEMBER WHEN THE SIDE MEMBER IS FOLDED, THE OTHER SAID SIDE MEMBER BEING PIVOTED TO SAID OFFSET PORTION MAIN FRAME MEMBER SO THAT IT MAY BE FOLDED FLAT AGAINST THE ONE SAID FOLDED SIDE FRAME MEMBER, A TRAY AND MEANS FOR MOUNTING SAID TRAY ADJACENT AN EDGE THEREOF ON THE 